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Results tagged with artificial-satellite
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user 158
Questions about objects in orbit which are human made, such as communications and GPS satellites, orbital observatories and space stations, and other man-made object in permanent or semi-permanent orbits around the Earth, other celestial objects, aside from the Sun, or even other satellites. Not to be confused with non-orbited man-made objects in space, that are usually referred to as "probes", or simply "spacecraft".
16
votes
Does a satellite naturally turn in phase with its orbit, always facing Earth?
Keeping the Same Face "Down"
There's a term for this when it naturally occurs: Tidelocking.
Natural orientation
One can make use of tidal stress to keep an orientation naturally.
When an object of sig …
- 11.6k
14
votes
Accepted
Can spacecraft be made invisible to stations on Earth?
Not particularly, at least not long term.
Let's take a hypothetical high earth orbit imaging satellite. We want it stealthy. Here are the iterations....
We have to account for the blackbody radiati …
- 11.6k
11
votes
Can you make out the shape of the ISS with the unaided eye as it passes overhead?
Human vision has an unaided resolution (typically) of around 0° 4'.
The ISS orbits at 370 km. It is approximately 73 m wide, 109m m long.
3.7e5 * sin(4') ≅ 430.5
Each "pixel" is roughly 430 m. That …
- 11.6k
9
votes
Does NASA plan to land on Europa?
"Plan" is a vague word...
NASA has an orbiter mission in the works: Europa Clipper as a predicate mission prior to any attempt to land.
A Europa Lander is a "concept under study" - that is, they are …
- 11.6k
9
votes
Are satellites able to stream real-time videos about certain parts of Earth's surface?
Short Answer
Yes.
Theory Answer
Satellite Television is broadcast at full 1080P high definition (1980x1080 px + sound + Closed Captioning + Program Metadata) data rates with many channels per satellit …
- 11.6k
8
votes
Is there any way to find and track Pioneer 10, 11, and Voyager 1, 2?
"Current" positional data:
Voyager 1 Spacecraft, ephemeris for Fri 7 February 2014, 02:13 UTC
Right Ascension: 17h 11m 54s Declination: +12° 01’ 12” (J2000) [HMS|00:00:00|Dec]
Distance from Su …
- 11.6k
7
votes
Can solar sail prevent orbital decay?
Between atmospheric drag out through almost 1000km, there's the issue that solar light and solar wind are both cut by the passing into the shadow of a planet.
Since this puts more of the energy on th …
- 11.6k